Syntax Definition wbr 5070

Description: Extend wff notation to include the general binary relation predicate. Note that the syntax is simply three class symbols in a row. Since binary relations are the only possible wff expressions consisting of three class expressions in a row, the syntax is unambiguous. (For an example of how syntax could become ambiguous if we are not careful, see the comment in cneg 11111.)

Hypotheses

Ref	Expression
cA	class 𝐴
cB	class 𝐵
cR	class 𝑅

Assertion

Ref	Expression
wbr	wff 𝐴𝑅𝐵

See definition df-br 5071 for more information.